I do some basic research on ads before accepting them in order to avoid ads for things which could be unexpectedly risky for forum users (eg. I just refused an ad for a brand new site which takes deposits, as that is generally risky), but I can't catch them all, unfortunately. In this case, I did my investigation around the 15th, which predated those scam accusations. After that, I didn't notice that there were any problems or I would've pulled it immediately.